Section 321.11. Foam plastic.

 

(1)  

(a) General. Foam plastic insulation shall have a flame-spread rating of 75 or less and a smoke-developed rating of 450 or less when tested in accordance with ASTM E-84.

(b) Thermal barrier. Except as provided in par. (c) , foam plastic insulation shall be separated from the interior of the dwelling by one of the following thermal barriers:

1. ½ -inch gypsum wallboard.

2. ½ -inch nominal wood structural panel.

3. ¾ -inch sawn lumber with tongue-and-groove or lap joints.

4. 1-inch of masonry or concrete.

5. A product or material shown by an independent laboratory to limit the temperature rise on the unexposed surface to 250 ° F for 15 minutes when tested in accordance with ASTM E-119.

6. For doors only, sheet metal with a minimum thickness of 26 standard steel gauge or aluminum with a minimum thickness of 0.032 inch.

(c) Exemptions from thermal barrier requirement. The following applications of foam plastic do not require a thermal barrier:

1. On overhead garage doors.

2. In the box sill of the basement or ground floor, above the bottom of the floor joists.

(2)  Insulation that does not meet the requirements of this section may be approved by the department in accordance with s. SPS 320.18 . Approval will be based on tests that evaluate materials or products representative of actual end-use applications.

Cr. Register, November, 1979, No. 287 , eff. 6-1-80; am. (1) (b), Register, January, 1989, No. 397 , eff. 2-1-89; r. and recr. (1) (intro.), am. (1) (a), renum. (1) (b) and (c) to be (1) (c) and (d) and am. (1) (c), cr. (1) (b), Register, March, 1992, No. 435 , eff. 4-1-92; am. (1) (d), (2), Register, November, 1995, No. 479 , eff. 12-1-95; r. and recr. Register, March, 2001, No. 543 , eff. 4-1-01; correction in (2) made under s. 13.92 (4) (b) 7. , Stats., Register December 2011 No. 672 .

Note

Number 26 standard steel gauge is approximately equal to 0.018-inch. Microsoft Windows NT 6.1.7601 Service Pack 1 See s. SPS 322.21 (3) for requirements for protecting foam plastic on the exterior of a dwelling. Microsoft Windows NT 6.1.7601 Service Pack 1